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Trash variable star 14 EP

HIP 31481

RA 98.9002° · Dec -62.6401° · star

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Score breakdown

· 4 badges
14 pts · Trash
Trash 15 pts → Common
  • Variable star +5
  • Gently variable +4
  • A named variable star +3
  • Main-sequence star +2
Total score 14

1 more point to reach Common.

Badges

  • Variable star · +5
  • Main-sequence star · +2
  • Gently variable · +4
  • A named variable star · +3

Trivia

Hard to believe

  • True brightness. It pours out about 94.6 thousand times as much light as the Sun. It only looks ordinary because it is so far away.

What it actually is

  • It changes. This star does not hold still: its brightness rises and falls on a rhythm of hours, days or years, either pulsing in size or being eclipsed by a companion.

Find it in the sky

  • How to spot it. At magnitude 12.4 it is far too faint for the eye: this one belongs to cameras and long exposures, over in Pictor.
  • Southern sky only. So far south it never rises for most of the northern hemisphere. To see it you'd have to travel to Chile, South Africa or Australia.
  • Best time of year. It stands highest in the middle of the night around December — that's when to go looking.

What's in a name

  • Its catalogue. The HIP number comes from Hipparcos, the ESA satellite that between 1989 and 1993 pinned down 118,000 stars precisely enough to triangulate their distances.

How we came to know it

  • Cosmic yardstick. Variable stars are how we measured the universe. In 1912 Henrietta Leavitt showed that a pulsating star's rhythm reveals its true brightness — turning these stars into distance markers.

Properties

absmag
-7.61
constellation
Pic
luminosity
96382.9024
mag
12.39
name
HIP 31481
spect
pec(NOVA)
var amplitude
0.45
var designation
RR
var max
12.175
var min
12.625

About HIP 31481

HIP 31481 is a trash variable star. It sits in the constellation Pic, shines at apparent magnitude 12.39 and has spectral type pec(NOVA).

This star does not hold still: its brightness rises and falls on a rhythm of hours, days or years, either pulsing in size or being eclipsed by a companion.

How to see it

Look for HIP 31481 in the constellation Pic. At apparent magnitude 12.39, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, HIP 31481 is best seen from a dark site away from city lights, and when it is above the horizon depends on your latitude and the time of year. The visibility panel above works out tonight's viewing window for your saved location.

Why HIP 31481 is a trash variable star

HIP 31481 scores 14 points on Spacedle's rarity scale, which places it in the trash tier. Another 1 point would lift it into a rarer tier.

That score comes from 4 science badges — Variable star, Main-sequence star, Gently variable and A named variable star — each earned for a real, measurable property of the object. Rarity on Spacedle is never random: the more remarkable an object's astrophysics, the more badges it collects, the higher it scores, and the rarer it ranks.